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Finding the Fourth Proportional to 553.42, 829.32 and 391.42

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Solution

The fourth proportional to 553.42, 829.32 and 391.42 is: 586.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.42 : 829.32 = 391.42 : x
  2. Step 2: Convert to fraction form
    553.42/829.32 = 391.42/x
  3. Step 3: Cross multiply
    553.42x = 829.32 × 391.42
  4. Step 4: Simplify right side
    553.42x = 324,612.43
  5. Step 5: Solve for x
    x = 324,612.43/553.42
  6. Step 6: Final answer
    x = 586.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.